Filter element for casings having inside-out flow



Jun 8, 1 H. G. KAMRATH 2,680,521 FILTER ELEMENT FOR CASINGS HAVING INSIDE-OUT FL OW Filed March 29, 1951 Patented June 8, 1954 I UNITED STATES PATENT orrica FILTER ELEMENT FOR CASINGS HAVING INSIDE-OUT FLOW Herbert G. Kamrath, Barrington, R. 1., assignor Fram Corporation, a corporation of Rhode s and Application March 29, 1951, Serial No. 218,190

4 Claims. (01. 210 1s3) This invention relates to a filter for removing of the center tube is threaded as at 2| and recontaminant from a liquid and is of a type used ceives a nut 22 having a handle 23 for holding for the filtration of lubricating oil and the like. the cover I4 in position on the casing. Within It is usual in this type of filtration to provide a this casing, I provide a filter element cartridge casing and leaves through the side wall of the wall 29 rolled into sealed engagement with the mu be us d A tubular core 3| extends axially through this n Of th O j o this invention is D shell 25 and is concentric with the cylindrical vide such a cartridge which may be utilized where side wall 25 t passes through th d wall the liquid enters the center tube but which will and is secured t usual cartridge although having different interlower end asoft washer 36 is held in position on nal arrangements. Y

with these and other objects in View the 31 e rie r t l ib e lz r i groil id e se al tl i es vi i vention consists of certain novel features of conr This cap 31 rests upon abutments '38 projecting struction as W111 be more fully described and particularly pointed out in the appended claims from the center tube so as to support the cartridge In the accompanying drawings. axially and position it in the casing as shown in Fig. 1 is a sectional view through a filter con- 1 of the drawmgs' structed in accordance with this invention; 1:116 center tube between the seals 34 and Fig 2 is a top plan View f a group of discs f 36 is provided with lateral openings 40 so that Fig 3 IS a perspectwe VleW of a fragmenta] between the center tube and the center core 3| tion of the bottom Wall of the filter element car- The bottom wall 29 is drawn downwardly as tridge, showing the iibbed construction thereof. shown in Figs 1 and 3 to provide a cup 42 WhlCh shell for the outside-in passage of liquid through nular chamber 4|. the filter material and thence out of the shell Ribs 45 are formed in the end wall 29 and into the Casing o that he q id may be received 40 while serving to stiffen the end wall also provide in the center tube of the casing and pass out of rests for a plate 46 which is sealed by a soft the side wall of the casing. gasket 47 on the tubular core 3| but these ribs With reference to the drawings, Ill designates provide a channel beneath the plate to the outer generally a filter casing having a cylindrical side cylindrical wall 25. Upon the plate there is 10- Wall H, a p-like bottom wall I2 welded thereto 45 cated the filter material 48, which comprises a as at I3, and a removable cover I4 which seals pulrality of lobular discs 49 shaped as shown in through a gasket I5 with a rolled edge I6 of the Fig. 2 with lobes 50 and spokes 5|. Spokes 5| side wall I I. A discharge opening I! is provided are of a greater radius than the lobes 50 so that in the side wall II through which liquid may leave a spoke 5| extends beyond the lobes when the the casing. 50 discs are stacked one on the other and each A center tube |8 extends axially through the oriented through 60 or a multiple thereof. Thus casing and communicates with the outside of the there is provided contaminant collecting cells 52 casing, providing an inlet opening I9. The between the spokes and the lobes so that liquid center tube is rigidly attached to the bottom wall may enter these cells, pass through the spokes by means of Welding as at 20. The upper end 55 or lobes in the shortest path of travel to the center opening 53 leaving the contaminant deposited in the cells. The opening 53 is in the shape of a six-pointed star with the portions closest to the axial center 54 contacting with the tubular core 3| while the points 55 provide spaces or the filtrate discharge conduits along the outer surface of the core axially thereof. These conduits of course are closed by the seal 41 at the lower end so that the pocket 43 will not communicate with these filtrate conduits.

The upper end wall 21 is drawn to provide an upwardly extending portion 60 which forms a pocket 61 with the tubular core 31 and communicates with the filtrate conduit such as 56 along the filter material. In order that the discs will seal with the smooth under surface of the top wall 21, these discs engage this top wall forced upwardly by a spring 62 located in the pocket 43 and forcing the disc upwardly, which also serves to keep the discs in firm contact with each other and to permit of some expansion or contraction of these discs, always maintaining them in proper pressure relation one to the other while also maintaining a seal for the pocket 61.

There is an opening 63 from the pocket 51 to the outer side of the shell so that filtrate liquid may pass therefrom into the space about the shell and beneath the half spherical hood 64 having openings 65 therein and thence out of the casing through the discharge opening 11.

It will be apparent that the liquid may enter at 19 as shown by the arrows, pass through opening 40 into the annular chamber M, thence through opening 44 into the pocket 43 beneath the plate '46 to the outer annular space 6 6 between the filter material and the wall 26 of the through the filter material into the filtrate conduit 56, thence to the pocket 51 out through opening 63 into the space in the casing about the shell and thence out of the casing as at 11. Thus, the flow to the filtrate material is from outside to inside while the flow in the easing appears to be from inside to outside. The cartridge may be easily removed by removing the cover 14, taking out the shell or cartridge 26 and replacing it with another.

I claim:

1. A filter cartridge for use in a casing having a discharge openng in its side wall, and a center tube forming an inlet at one end of the casing and extending lengthwise through the casing and having a discharge hole in its wall, said cartridge comprising a shell with side and end walls and an axially extending core that is secured to said end walls with a tight joint and loosely surrounds said tube, means for sealing said end walls about the tube with tight joints, filtering material in said shell spaced from the side wall of the shell and from the core sufiiciently to provide a liquid passage therebetween, and means providing a passage from adjacent one end of the core to the space between the filter element and said side wall and from the space between the core and filter element to the area within the casing, whereby an outsidein filtering action is secured and the liquid is filtered before it contacts the casing walls.

a casing having a discharge opening along a wall thereof, a center tube communicating with the outside of the easing for entrance thereto and extending lengthwise through the center of the casing, a removable filter element comprising a shell with side and end walls with an axially extending tubular core opening through the end walls and through which the center tube extends and serves as the sole means to support said element, means to seal the end walls with the center tube to provide an annular chamber, said center tube having an inlet opening into said chamber, filtering material in said shell shaped to provide a filtrate conduit along the outer surface of said core and spaced from the side wall, said end walls being cupped to provide pockets, one of said pockets being sealed from the filtering material and provided with an opening to said annular chamber and a conduit to the space between said filter element and the side wall and the other pocket communicating with said filtrate conduit and having an opening to the outside of the shell for passage of the filtrate into the casing and thence to the discharge opening.

3. A filter as in claim 2 wherein the filter material is urged toward one end wall by a spring acting between the other end wall and the filter material.

4. A filter as in claim 2 wherein the filter material is urged toward one end wall having the pocket communicating with the outside of the shell by a spring located in the opposite pocket.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 516,140 Weir Mar. 6, 1894 1,844,611 Spackman Feb. 9, 1932 2,067,439 Dooley Jan. 12, 1937 2,247,445 Long July 1, 1941 2,429,321 La Brecque Oct. 21, 1947 2,473,727 Robertson June 21, 1949 2,522,502 Clark Sept. 19, 1950 2,522,975 Voorhees Sept. 19, 1950 2,548,584 Briggs Apr. 10, 1951 2,564,637 Chase Aug. 14, 1951 FOREIGN PATENTS Number Country Date 198,700 Switzerland July 15, 1933 

